Home
Back
Charge Equation:
| From: | To: |
The fundamental equation Q = I × t calculates electric charge from current and time. This relationship is one of the basic principles of electricity and electromagnetism, showing how charge accumulates over time with a constant current flow.
The calculator uses the charge equation:
Where:
Explanation: This equation demonstrates that the total charge transferred is directly proportional to both the current and the time during which the current flows.
Details: Calculating electric charge is essential in circuit design, battery capacity estimation, electrochemistry, and understanding electrical phenomena in various applications from electronics to industrial processes.
Tips: Enter current in amperes and time in seconds. Both values must be positive numbers. The calculator will compute the resulting charge in coulombs.
Q1: What is a coulomb?
A: A coulomb is the standard unit of electric charge in the International System of Units (SI), equivalent to the charge transferred by a constant current of one ampere in one second.
Q2: Can this equation be used for alternating current?
A: This simple form applies to direct current (DC). For alternating current (AC), the calculation is more complex as it involves integration of current over time.
Q3: How is this related to battery capacity?
A: Battery capacity is often measured in ampere-hours (Ah), which is directly related to the total charge a battery can deliver (1 Ah = 3600 coulombs).
Q4: What if the current changes over time?
A: For varying current, the total charge is calculated by integrating current with respect to time: Q = ∫I dt.
Q5: How accurate is this calculation?
A: The calculation is mathematically exact for constant current. Accuracy in practical applications depends on the precision of current and time measurements.